Good question and on a great line from Camaldolese Father Cornelius Wencel!! I think this line is especially provocative and a good way to help dioceses and others discern authentic vocations to eremitical life as well. In approaching this line, I come at it in a couple of ways. First, I pay attention to the meaning of the phrase, "spirit of separation" and second, I look at what it means to cherish something. The canon reads "Stricter separation from the world, but it does not say anything at this point about what the spirit that drives this is. Later on, however, it says that the hermit lives in the various ways she does for the praise of God and the salvation of the world. Here is where, I think, the canon is getting at the Spirit that drives a hermit's separation from the world and it is not the spirit of separation!
Instead, the spirit that drives my separation from the world is the spirit of compassion for the world, and, in Christ, the spirit of engagement for the sake of the world's salvation as well as for the praise or glorification (revelation) of God and God's Church. This kind of engagement (like all truly loving engagement) requires commitment to be grounded in both intimacy or closeness to, and in some definite distance from that to which we are committed. Otherwise, we lose ourselves in the thing itself (this is what we call enmeshment), and once that happens, we cannot truly love it effectively or ourselves either. So, hermits accept stricter separation from the world, first of all to commit ourselves to God more completely, and in order to love the world that is resistant to Christ into greater wholeness through the power of God's love. In this way of seeing what c 603 calls for, stricter separation is a form of penance embraced for a larger and other-centered purpose. In the langiuage of the Desert Abbas and Ammas, this was called anachoresis, a healthy withdrawal from that which was resistant to (or insufficiently committed to) Christ in order to bring all of reality into unity with God in Christ.
But Cornelius Wencel also refers to not cherishing the spirit of separation and being closed to the social aspects of life and of being cut off from any form of communal life and the problems of this world, and notes that many great hermits reveal that any authentically spiritual experience (which, he observes, is always the culmination of an experience of love) "leads to an attitude of ministry" (service). In other words, eremitical life is not about admiring, esteeming, revering, or protecting, the spirit of separation. Rather, the hermit is called to truly love God and others so they can be themselves as fully as possible (and so the hermit can also!!), and that means embracing the spirit of engagement which will include, and not be driven by, much less cherish, the spirit of separation!There is a paradox right at the heart of c 603's phrase "stricter separation from the world". If one misunderstands what the canon means by "the world", or, if one believes c 603 is calling for what Wencel identifies as the "spirit of separation" rather than the spirit of engagement rooted in authentic love, one will mistake what eremitical life, and especially c 603 eremitical life is all about. Then one will begin to absolutize the various elements of the canon and make idols of them rather than servants of the life. Canon 603 means what it says when it defines the spirit which is to shape and drive one's anachoresis and it is not selfishness, concern with one's own spiritual purity, fear of the "worldliness" of others, escape from the spatio-temporal, or a sense that we are more spiritual than others. Again, the withdrawal the hermit embraces is driven by love and the spirit of engagement, both with God and with all that God truly cherishes. This, by the way, is the same Spirit that informs the vocation's ecclesiality and allowed the Church to perceive the vocations of the Desert Fathers and Mothers, as well as embrace the c 603 vocation as ecclesial.

